So what we'll have here is a trigonal planar case, and you can see that we only have three electrons that are set for bonding, so we'll add three hydrogens, and for b h 3, we'll get a stable structure here.

让电子劲量远离的时候，不用考虑它,这个例子是平面三角形，你可以看到，只有3个电子可以成键。

化学原理课程节选 : 麻省理工公开课

Let's multiply both sides by 2, I'll get 2q1* is equal to a - c over b - q1*.

等式两边同时乘以2,得到,2q1*=/b-q1

博弈论课程节选 : 耶鲁公开课

Because the B+ or A- people, B- you know it, they'll hire B's and B minuses.

原本想要B+或者A-的人，实际能力评分只有B或者。

扎克伯格谈Facebook创业过程课程节选 : 斯坦福公开课